GCN Circular 46265
Subject
GRB 261113A: SVOM/COLIBRÍ (FM-GFT) optical observations
Event
Date
2026-11-14T09:31:10Z (21 hours ago)
From
Antonio de Ugarte Postigo at LAM, CNRS <adeugartepostigo@gmail.com>
Via
email
Antonio de Ugarte Postigo (LAM), Ramandeep Gill (UNAM), Stéphane Basa (UAR Pytheas), William H. Lee (UNAM), Edilberto Aguilar-Ruiz (UNAM), Jean-Luc Atteia (IRAP), Camila Angulo (UNAM), Dalya Akl (NYUAD), Sarah Antier (IJCLAB), Rosa L. Becerra (UNAM), Nathaniel R. Butler (ASU), Damien Dornic (CPPM), Jean-Grégoire Ducoin (CPPM), Francis Fortin (IRAP), Leonardo García-García (UNAM), Noémie Globus (UNAM), Marion Guelfand (CPPM), Asuka Kuwata (UNAM), Massimiliano Lincetto (CPPM), Nikos Mandarakas (LAM), Diego López-Cámara (UNAM), Francesco Magnani (CPPM), Enrique Moreno Méndez (UNAM), Margarita Pereyra (UNAM), Fredd Sánchez Álvarez (UNAM), Benjamin Schneider (LAM), Alan M. Watson (UNAM), Andrea Saccardi (CEA/Irfu), Sofia Bisero (CEA/Irfu) report:
We imaged the field of the SVOM GRB 261113A (Saccardi et al., GCN Circ. 46244) using the DDRAGO wide-field imager on the SVOM/COLIBRÍ (FM-GFT) telescope. We observed from 2026-11-14 07:13:39.794 to 2026-11-14 07:32:58.444 UTC (from 16.6739 - 16.9958 hours after the trigger) and obtained 16 minutes of exposure in the r filter.
The data were reduced and coadded and analyzed with the COLIBRÍ pipeline. The photometry was calibrated using nearby stars from the Legacy Survey, is in the AB system, and is not corrected for Galactic extinction.
We detected the optical counterpart reported by Lin et al., GCN Circ. 46247, at a preliminary magnitude of:
r = 22.80 +/- 0.25
We thank the staff of the Observatorio Astronómico Nacional at Sierra de San Pedro Mártir, as well as the technical and engineering teams at CEA, CPPM, IRAP, LAM, OHP, OSU Pytheas, and UNAM.
COLIBRÍ is an astronomical observatory developed and operated jointly by France (AMU, CNES and CNRS) and Mexico (UNAM and SECIHTI). It is located at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir, Baja California, Mexico.